package com.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.reggie.common.BaseContext;
import com.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;

        long id = Thread.currentThread().getId();
        log.info("线程id为：{}",id);

        //1.获取本次请求的URI
        String requestURI = req.getRequestURI();
        //定义不需要处理的请求路径
        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(req,resp);
            return;
        }
        //4.判断登录状态，登录放行
        if (req.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为:{}",req.getSession().getAttribute("employee"));

            Long empId = (Long) req.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(req,resp);
            return;
        }
        //5.判断移动端登录状态，登录放行
        if (req.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为:{}",req.getSession().getAttribute("user"));

            Long userId = (Long) req.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(req,resp);
            return;
        }

        log.info("用户未登录");
        //6.未登录返回未登录结果，通过输出流方式向客户端响应数据
        resp.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
